Relay communication

Abstract

One disclosure of the specification provides a method. The method can include receiving an additional parameter announcement request message sent by a remote UE, sending the additional parameter announcement request message to a UE-to-Network relay, receiving a first relay discovery additional information message from the UE-to-Network relay, and sending a second relay discovery additional information message to the remote UE.

Description

Technical Field

[0001] This specification relates to a type of radio communication. Background Technology

[0002] The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a technology for achieving high-speed packet communication. Many proposals have been put forward for LTE goals, including those aimed at reducing user and vendor costs, improving service quality, and expanding and increasing coverage and system capacity. 3GPP LTE requires lower cost per bit, increased service availability, flexible use of frequency bands, a simple architecture, open interfaces, and appropriate power consumption in terminals as higher-level requirements.

[0003] Work has begun within the International Telecommunication Union (ITU) and 3GPP to develop requirements and specifications for New Radio (NR) systems. 3GPP must identify and develop the technical components necessary for the successful standardization of the new RAT, meeting both pressing market demands and the longer-term requirements outlined in the ITU Radiocommunication Sector (ITU-R) International Mobile Telecommunications (IMT)-2020 process. Furthermore, NR should be able to utilize any frequency band within at least up to 130 GHz, and these bands should be available for wireless communication even in the more distant future.

[0004] The goal of NR is to address all use cases, requirements, and deployment scenarios with a single technology framework, including enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable and low-latency communications (URLLC). NR should inherently be backward compatible.

[0005] There is a need for a method to support multi-hop UE to network relay, where one or more relay UEs provide services to a remote UE. Under existing technology, there is a problem that relay-related parameters are not effectively provided to the remote UE. Summary of the Invention

[0006] Technical solution

[0007] In one aspect, a method is provided. The method may include: receiving an Additional Parameter Advertisement Request message sent by a remote UE; sending the Additional Parameter Advertisement Request message to a UE-to-network relay; receiving a first relay discovery additional information message from the UE-to-network relay; and sending a second relay discovery additional information message to the remote UE.

[0008] On the other hand, a device for implementing the method is provided.

[0009] In one aspect, a method is provided. This method may include: receiving an additional parameter notification request message sent by a remote UE from an intermediate UE to a network relay; and sending a first relay discovery additional information message to the intermediate UE to the network relay.

[0010] On the other hand, a device for implementing the method is provided. Attached Figure Description

[0011] Figure 1 An example of a communication system that applies the implementation of this disclosure is shown.

[0012] Figure 2 An example of a wireless device that applies the implementation of this disclosure is shown.

[0013] Figure 3 An example of a UE that applies the implementation of this disclosure is shown.

[0014] Figure 4 An example of a 5G system architecture applying the implementation of this disclosure is shown.

[0015] Figure 5 An example of the UE to network relay discovery process according to Model A is shown.

[0016] Figure 6 An example of the UE-to-network relay discovery process according to Model B is shown.

[0017] Figure 7 The first example of a scenario related to the announcement of additional parameters in multi-hop UE to network relay is shown.

[0018] Figure 8 A second example of a scenario related to the announcement of additional parameters in multi-hop UE to network relay is shown.

[0019] Figure 9 An example of a process related to the notification of additional parameters in a multi-hop UE to network relay is shown according to an embodiment of this disclosure.

[0020] Figures 10a to 10c An example of an initial access procedure for a remote UE according to an embodiment of the present disclosure is shown.

[0021] Figure 11 An example of relay communication according to an embodiment of this disclosure is shown.

[0022] Figure 12 An example of a process related to the notification of additional parameters according to an embodiment of this disclosure is shown.

[0023] Figure 13 An example of an operation performed according to an embodiment of this disclosure is shown. Detailed Implementation

[0024] The following technologies, devices, and systems can be applied to a variety of wireless multiple access systems. Examples of multiple access systems include Code Division Multiple Access (CDMA) systems, Frequency Division Multiple Access (FDMA) systems, Time Division Multiple Access (TDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single-Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Multi-Carrier Frequency Division Multiple Access (MC-FDMA) systems. CDMA can be implemented using radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented using radio technologies such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), or Enhanced Data Rate GSM Evolution (EDGE). OFDMA can be implemented using radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, or Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of the Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE employs OFDMA in the downlink (DL) and SC-FDMA in the uplink (UL). The evolution of 3GPP LTE includes LTE-Advanced (LTE-A), LTE-A Pro, and / or 5G New Radio (NR).

[0025] For ease of description, the implementation of this disclosure is primarily described with respect to 3GPP-based wireless communication systems. However, the technical features of this disclosure are not limited thereto. For example, although the following detailed description is based on mobile communication systems corresponding to 3GPP-based wireless communication systems, the aspects of this disclosure that are not limited to 3GPP-based wireless communication systems are applicable to other mobile communication systems.

[0026] For any terms and techniques used in this disclosure that are not specifically described in this disclosure, please refer to wireless communication standards documents published prior to this disclosure.

[0027] In this disclosure, "A or B" can mean "A only", "B only", or "both A and B". In other words, "A or B" in this disclosure can be interpreted as "A and / or B". For example, "A, B or C" in this disclosure can mean "A only", "B only", "C only", or "any combination of A, B and C".

[0028] In this disclosure, a forward slash ( / ) or a comma (,) can mean "and / or". For example, "A / B" can mean "A and / or B". Therefore, "A / B" can mean "A only", "B only", or "both A and B". For example, "A, B, C" can mean "A, B, or C".

[0029] In this disclosure, "at least one of A and B" can mean "only A", "only B" or "both A and B". Furthermore, the expressions "at least one of A or B" or "at least one of A and / or B" in this disclosure can be interpreted as the same as "at least one of A and B".

[0030] Additionally, in this disclosure, "at least one of A, B, and C" may mean "only A," "only B," "only C," or "any combination of A, B, and C." Furthermore, "at least one of A, B, or C" or "at least one of A, B, and / or C" may mean "at least one of A, B, and C."

[0031] Furthermore, the brackets used in this disclosure may mean "for example". Specifically, when it is shown as "Control Information (PDCCH)", "PDCCH" can be cited as an example of "Control Information". In other words, "Control Information" in this disclosure is not limited to "PDCCH", and "PDCCH" can be cited as an example of "Control Information". In addition, even when shown as "Control Information (i.e., PDCCH)", "PDCCH" can be cited as an example of "Control Information".

[0032] The technical features described individually in one of the accompanying drawings of this disclosure can be implemented individually or simultaneously.

[0033] Although not limited thereto, the various descriptions, functions, processes, suggestions, methods and / or operation flowcharts disclosed herein can be applied to various fields that require wireless communication and / or connectivity between devices (e.g., 5G).

[0034] In the following description, this disclosure will be described in more detail with reference to the accompanying drawings. Unless otherwise stated, the same reference numerals in the following drawings and / or description may refer to the same and / or corresponding hardware blocks, software blocks and / or functional blocks.

[0035] Figure 1 An example of a communication system that applies the implementation of this disclosure is shown.

[0036] Figure 1 The 5G use cases shown are merely illustrative, and the technical features of this disclosure can be applied to... Figure 1 Other 5G use cases not shown.

[0037] The three main requirement categories for 5G include (1) Enhanced Mobile Broadband (eMBB), (2) Massive Machine Type Communications (mMTC), and (3) Ultra Reliable and Low Latency Communications (URLLC).

[0038] Reference Figure 1 The communication system 1 includes wireless devices 100a to 100f, a base station (BS) 200, and a network 300. Although Figure 1 An example of a 5G network as a network of communication system 1 is shown, but the implementation of this disclosure is not limited to 5G systems and can be applied to future communication systems other than 5G systems.

[0039] BS 200 and network 300 can be implemented as wireless devices, and a particular wireless device can operate as a BS / network node relative to other wireless devices.

[0040] Wireless devices 100a to 100f represent devices that perform communication using radio access technology (RAT) (e.g., 5G NR or LTE) and may be referred to as communication / radio / 5G devices. Wireless devices may include (but are not limited to) robots 100a, vehicles 100b-1 and 100b-2, extended reality (XR) devices 100c, handheld devices 100d, home appliances 100e, Internet of Things (IoT) devices 100f, and artificial intelligence (AI) devices / servers 400. For example, vehicles may include vehicles with wireless communication capabilities, autonomous vehicles, and vehicles capable of performing communication between vehicles. Vehicles may include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and may be implemented in the form of head-mounted displays (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Handheld devices may include smartphones, smart tablets, wearable devices (e.g., smartwatches or smart glasses), and computers (e.g., laptops). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters.

[0041] In this disclosure, wireless devices 100a to 100f may be referred to as user equipment (UE). UE may include, for example, cellular phones, smartphones, laptop computers, digital broadcasting terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation systems, tablet PCs, tablet PCs, ultrabooks, vehicles, vehicles with autonomous driving capabilities, connected cars, UAVs, AI modules, robots, AR devices, VR devices, MR devices, holographic devices, public safety devices, MTC devices, IoT devices, medical devices, FinTech devices (or financial devices), security devices, weather / environment devices, devices related to 5G services, or devices related to the Fourth Industrial Revolution.

[0042] Wireless devices 100a to 100f can connect to network 300 via BS 200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can connect to AI server 400 via network 300. Network 300 can be configured using 3G, 4G (e.g., LTE), 5G (e.g., NR), and super 5G networks. Although wireless devices 100a to 100f can communicate with each other via BS 200 / network 300, wireless devices 100a to 100f can also perform direct communication (e.g., sidelink communication) without going through BS 200 / network 300. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0043] Wireless communication / connections 150a, 150b, and 150c can be established between wireless devices 100a to 100f and / or between wireless devices 100a to 100f and BS 200 and / or between BS 200. In this document, wireless communication / connections can be established via various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication (or device-to-device (D2D) communication) 150b, and inter-base station communication 150c (e.g., relay, integrated access and backhaul (IAB)). Wireless devices 100a to 100f and BS 200 / wireless devices 100a to 100f can send / receive radio signals to / from each other via wireless communication / connections 150a, 150b, and 150c. For example, wireless communication / connections 150a, 150b, and 150c can send / receive signals via various physical channels. Therefore, at least a portion of various configuration information configuration processes, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes for transmitting / receiving radio signals can be performed based on various proposals of this disclosure.

[0044] NR supports multiple parameter sets (and / or multiple subcarrier spacings (SCS)) to support a variety of 5G services. For example, if the SCS is 15 kHz, wide-area coverage can be supported in traditional cellular bands, and if the SCS is 30 kHz / 60 kHz, dense urban areas, lower latency, and wider carrier bandwidth can be supported. If the SCS is 60 kHz or higher, bandwidths greater than 24.25 GHz can be supported to overcome phase noise.

[0045] NR bands can be defined as two types of frequency ranges: frequency range 1 (FR1) and frequency range 2 (FR2). The numerical values ​​of the frequency ranges can be varied. For example, the two types (FR1 and FR2) of frequency ranges can be shown in Table 1 below. For ease of explanation, in the frequency ranges used in NR systems, FR1 can represent "below 6 GHz" and FR2 can represent "above 6 GHz," and can also be referred to as millimeter wave (mmW).

[0046] [Table 1]

[0047] As mentioned above, the frequency range of the NR system can be varied. For example, FR1 can include a frequency band from 410 MHz to 7125 MHz, as shown in Table 2 below. That is, FR1 can include a frequency band of 6 GHz (or 5850 MHz, 5900 MHz, 5925 MHz, etc.) or higher. For example, the 6 GHz (or 5850 MHz, 5900 MHz, 5925 MHz, etc.) or higher frequency bands included in FR1 can include unlicensed frequency bands. Unlicensed frequency bands can be used for various purposes, such as for vehicle communications (e.g., autonomous driving).

[0048] [Table 2]

[0049] Here, the radio communication technologies implemented in the wireless devices of this disclosure may include narrowband IoT (NB-IoT) technologies for low-power communication, as well as LTE, NR, and 6G. For example, NB-IoT technology may be an example of low-power wide-area network (LPWAN) technology, implemented in specifications such as LTE Cat NB1 and / or LTE Cat NB2, and may not be limited to the names mentioned above. Additionally and / or alternatively, the radio communication technologies implemented in the wireless devices of this disclosure may communicate based on LTE-M technology. For example, LTE-M technology may be an example of LPWAN technology and may be referred to by various names such as enhanced MTC (eMTC). For example, LTE-M technology may be implemented in at least one of various specifications such as 1) LTE Cat 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine-type communication, and / or 7) LTE M, and may not be limited to the names mentioned above. Additionally and / or alternatively, the radio communication technologies implemented in the wireless devices of this disclosure may include at least one of ZigBee, Bluetooth, and / or LPWAN, which take into account low-power communication, and may not be limited to the names mentioned above. For example, ZigBee technology may generate personal area networks (PANs) associated with low-power / low-power digital communication based on various specifications such as IEEE 802.15.4, and may be referred to by various names.

[0050] Figure 2 An example of a wireless device that applies the implementation of this disclosure is shown.

[0051] exist Figure 2 In this context, the first wireless device 100 and / or the second wireless device 200 can be implemented in various forms depending on the use case / service. For example, {the first wireless device 100 and the second wireless device 200} can correspond to... Figure 1At least one of {wireless devices 100a to 100f and BS 200}, {wireless devices 100a to 100f and wireless devices 100a to 100f} and / or {BS 200 and BS 200}. The first wireless device 100 and / or the second wireless device 200 may be configured from various elements, devices / components and / or modules.

[0052] The first wireless device 100 may include at least one transceiver (e.g., transceiver 106), at least one processing chip (e.g., processing chip 101), and / or one or more antennas 108.

[0053] The processing chip 101 may include at least one processor (e.g., processor 102) and at least one memory (e.g., memory 104). Additionally and / or alternatively, the memory 104 may be located outside the processing chip 101.

[0054] Processor 102 can control memory 104 and / or transceiver 106, and can be adapted to implement the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts described in this disclosure. For example, processor 102 can process information in memory 104 to generate first information / signal, and then transmit a radio signal including the first information / signal via transceiver 106. Processor 102 can receive a radio signal including a second information / signal via transceiver 106, and then store the information obtained by processing the second information / signal in memory 104.

[0055] Memory 104 may be operatively connected to processor 102. Memory 104 may store various types of information and / or instructions. Memory 104 may store firmware and / or software code 105 that implements code, commands, and / or command sets, which, when executed by processor 102, execute the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in this disclosure. For example, firmware and / or software code 105 may implement instructions that, when executed by processor 102, execute the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in this disclosure. For example, firmware and / or software code 105 may control processor 102 to execute one or more protocols. For example, firmware and / or software code 105 may control processor 102 to execute one or more layers of a radio interface protocol.

[0056] In this document, processor 102 and memory 104 may be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). Transceiver 106 may be connected to processor 102 and transmit and / or receive radio signals via one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. Transceiver 106 may be used interchangeably with radio frequency (RF) units. In this disclosure, first wireless device 100 may represent a communication modem / circuit / chip.

[0057] The second wireless device 200 may include at least one transceiver (e.g., transceiver 206), at least one processing chip (e.g., processing chip 201), and / or one or more antennas 208.

[0058] The processing chip 201 may include at least one processor (e.g., processor 202) and at least one memory (e.g., memory 204). Additionally and / or alternatively, the memory 204 may be located outside the processing chip 201.

[0059] Processor 202 can control memory 204 and / or transceiver 206, and can be adapted to implement the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts described in this disclosure. For example, processor 202 can process information in memory 204 to generate third information / signal, and then transmit a radio signal including the third information / signal via transceiver 206. Processor 202 can receive a radio signal including a fourth information / signal via transceiver 106, and then store the information obtained by processing the fourth information / signal in memory 204.

[0060] Memory 204 may be operatively connected to processor 202. Memory 204 may store various types of information and / or instructions. Memory 204 may store firmware and / or software code 205 that implements code, commands, and / or command sets, which, when executed by processor 202, execute the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in this disclosure. For example, firmware and / or software code 205 may implement instructions that, when executed by processor 202, execute the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in this disclosure. For example, firmware and / or software code 205 may control processor 202 to execute one or more protocols. For example, firmware and / or software code 205 may control processor 202 to execute one or more layers of a radio interface protocol.

[0061] In this document, processor 202 and memory 204 may be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). Transceiver 206 may be connected to processor 202 and transmit and / or receive radio signals via one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. Transceiver 206 may be used interchangeably with an RF unit. In this disclosure, second wireless device 200 may represent a communication modem / circuit / chip.

[0062] The hardware elements of wireless devices 100 and 200 will be described in more detail below. One or more protocol layers can be implemented by (but are not limited to) one or more processors 102 and 202. For example, one or more processors 102 and 202 can implement one or more layers (e.g., functional layers such as the Physical (PHY) layer, Medium Access Control (MAC) layer, Radio Link Control (RLC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Resource Control (RRC) layer, and Service Data Adaptation Protocol (SDAP) layer). One or more processors 102 and 202 can generate one or more Protocol Data Units (PDUs), one or more Service Data Units (SDUs), messages, control information, data, or information in accordance with the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in this disclosure. One or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) in accordance with the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in this disclosure. One or more processors 102 and 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in this disclosure. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information in accordance with the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in this disclosure, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive signals (e.g., baseband signals) from one or more transceivers 106 and 206 and acquire PDUs, SDUs, messages, control information, data, or information, in accordance with the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in this disclosure.

[0063] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field-programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. For example, one or more processors 102 and 202 may be configured by a set of communication control processors, application processors (APs), electronic control units (ECUs), central processing units (CPUs), graphics processing units (GPUs), and memory control processors. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories 104 and 204 may be configured with random access memory (RAM), dynamic RAM (DRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EPROM), flash memory, volatile memory, non-volatile memory, hard disk drive, registers, buffer memory, computer-readable storage media, and / or combinations thereof. One or more memories 104 and 204 may be located internally and / or externally to one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0064] One or more transceivers 106 and 206 can transmit user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in this disclosure to one or more other devices. One or more transceivers 106 and 206 can receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in this disclosure from one or more other devices. For example, one or more transceivers 106 and 206 can be connected to one or more processors 102 and 202 and transmit and receive radio signals. For example, one or more processors 102 and 202 can perform control to enable one or more transceivers 106 and 206 to transmit user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 can perform control to enable one or more transceivers 106 and 206 to receive user data, control information, or radio signals from one or more other devices.

[0065] One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208. Additionally and / or alternatively, one or more transceivers 106 and 206 may include one or more antennas 108 and 208. One or more transceivers 106 and 206 may be adapted to transmit and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed herein via one or more antennas 108 and 208. In this disclosure, one or more antennas 108 and 208 may be multiple physical antennas or multiple logical antennas (e.g., antenna ports).

[0066] One or more transceivers 106 and 206 can convert received user data, control information, radio signals / channels, etc., from RF band signals into baseband signals so that the received user data, control information, radio signals / channels, etc., can be processed by one or more processors 102 and 202. One or more transceivers 106 and 206 can also convert user data, control information, radio signals / channels, etc., processed by one or more processors 102 and 202 from baseband signals into RF band signals. For this purpose, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters. For example, one or more transceivers 106 and 206, under the control of one or more processors 102 and 202, can up-convert OFDM baseband signals to OFDM signals using their (analog) oscillators and / or filters, and transmit the up-converted OFDM signals at the carrier frequency. One or more transceivers 106 and 206 can receive OFDM signals at a carrier frequency and, under the control of one or more processors 102 and 202, downconvert the OFDM signals to OFDM baseband signals via their (analog) oscillators and / or filters.

[0067] although Figure 2 Not shown, but wireless devices 100 and 200 may also include additional components. Additional component 140 may be configured differently depending on the type of wireless devices 100 and 200. For example, additional component 140 may include at least one of a power unit / battery, input / output (I / O) devices (e.g., audio I / O ports, video I / O ports), drive devices, and computing devices. Additional component 140 may be coupled to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0068] In the implementation of this disclosure, the UE can operate as a transmitting device in the uplink (UL) and as a receiving device in the downlink (DL). In the implementation of this disclosure, the BS can operate as a receiving device in the UL and as a transmitting device in the DL. Hereinafter, for ease of description, it is primarily assumed that the first wireless device 100 acts as the UE and the second wireless device 200 acts as the BS. For example, a processor 102 connected to, installed on, or started in the first wireless device 100 can be adapted to perform UE operations according to the implementation of this disclosure, or to control the transceiver 106 to perform UE operations according to the implementation of this disclosure. A processor 202 connected to, installed on, or started in the second wireless device 200 can be adapted to perform BS operations according to the implementation of this disclosure, or to control the transceiver 206 to perform BS operations according to the implementation of this disclosure.

[0069] In this disclosure, BS is also referred to as Node B (NB), eNodeB (eNB), or gNB.

[0070] Figure 3 An example of a UE that applies the implementation of this disclosure is shown.

[0071] Reference Figure 3 UE 100 can correspond to Figure 2 The first wireless device 100.

[0072] The UE 100 includes a processor 102, a memory 104, a transceiver 106, one or more antennas 108, a power management module 141, a battery 142, a display 143, a keyboard 144, a subscriber identification module (SIM) card 145, a speaker 146, and a microphone 147.

[0073] Processor 102 may be adapted to implement the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in this disclosure. Processor 102 may be adapted to control one or more other components of UE 100 to implement the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed in this disclosure. The radio interface protocol layer may be implemented in processor 102. Processor 102 may include an ASIC, other chipsets, logic circuits, and / or data processing means. Processor 102 may be an application processor. Processor 102 may include at least one of a DSP, CPU, GPU, and modem (modulator and demodulator). It may be manufactured by Qualcomm. ® Manufacturing SNAPDRAGON TM Series processors, by Samsung ® EXYNOS manufacturedTM Series processors, manufactured by Apple ® The A-series processors manufactured by MediaTek ® HELIO manufactured TM Series processors, manufactured by Intel ® Manufactured ATOM TM An example of processor 102 can be found in the series of processors or the corresponding next-generation processors.

[0074] Memory 104 is operatively coupled to processor 102 and stores various information for operating processor 102. Memory 104 may include ROM, RAM, flash memory, memory card, storage medium, and / or other storage devices. When the implementation is software-based, the techniques described herein can be implemented using modules (e.g., processes, functions, etc.) that perform the descriptions, functions, processes, suggestions, methods, and / or operation flowcharts disclosed herein. Modules may be stored in memory 104 and executed by processor 102. Memory 104 may be implemented within or outside processor 102, in which case those memories may be communicatively coupled to processor 102 via various means known in the art.

[0075] Transceiver 106 is operatively coupled to processor 102 and transmits and / or receives radio signals. Transceiver 106 includes a transmitter and a receiver. Transceiver 106 may include baseband circuitry for processing radio frequency signals. Transceiver 106 controls one or more antennas 108 to transmit and / or receive radio signals.

[0076] The power management module 141 manages the power of the processor 102 and / or transceiver 106. The battery 142 supplies power to the power management module 141.

[0077] Display 143 outputs the results processed by processor 102. Keyboard 144 receives input that will be used by processor 102. Keyboard 144 can be displayed on display 143.

[0078] The SIM 145 is an integrated circuit designed to securely store the International Mobile Subscriber Identity (IMSI) number and its associated keys. The IMSI number and its associated keys are used to identify and authenticate subscribers on mobile devices such as mobile phones and computers. It can also store contact information associated with many SIM cards.

[0079] Speaker 146 outputs sound-related results processed by processor 102. Microphone 147 receives sound-related input to be used by processor 102.

[0080] Figure 4 An example of a 5G system architecture applying the implementation of this disclosure is shown.

[0081] The 5G system (5GS) architecture includes the following network functions (NFs).

[0082] - Authentication Server Function (AUSF)

[0083] - Access and Mobility Management Function (AMF)

[0084] - Data networks (DN), such as carrier services, internet access, or third-party services.

[0085] - Unstructured Data Storage Function (UDSF)

[0086] - Network Exposure Function (NEF)

[0087] - Intermediate NEF (I-NEF)

[0088] - Network Repository Function (NRF)

[0089] - Network Slice Selection Function (NSSF)

[0090] - Policy Control Function (PCF)

[0091] - Session Management Function (SMF)

[0092] - Unified Data Management (UDM)

[0093] - Unified Data Repository (UDR)

[0094] - User Plane Function (UPF)

[0095] - UE Radio Capability Management Function (UCMF)

[0096] - Application Functionality (AF)

[0097] - User Equipment (UE)

[0098] - (Radio) Access Network ((R)AN)

[0099] - 5G-Device Identifier Register (5G-EIR)

[0100] - Network Data Analysis Function (NWDAF)

[0101] - Billing Function (CHF)

[0102] In addition, the following network functions can be considered.

[0103] - Non-3GPP Interoperability Function (N3IWF)

[0104] - Trusted Non-3GPP Gateway Function (TNGF)

[0105] - Wired Access Gateway Function (W-AGF)

[0106] Figure 4 The architecture of a 5G system in a non-roaming scenario is depicted, using reference point representations to show how various network functions interact with each other.

[0107] exist Figure 4 For clarity of the point-to-point graph, UDSF, NEF, and NRF are not depicted. However, all depicted network functions can interact with UDSF, UDR, NEF, and NRF as needed.

[0108] For clarity, Figure 4 The document does not depict the UDR or its connections to other NFs (e.g., PCFs). For clarity, Figure 4 The NWDAF and its connections with other NFs (e.g., PCF) are not described.

[0109] The 5G system architecture includes the following reference points: - N1: Reference point between UE and AMF.

[0110] - N2: Reference point between (R)AN and AMF.

[0111] - N3: Reference point between (R)AN and UPF.

[0112] - N4: Reference point between SMF and UPF.

[0113] - N6: Reference point between UPF and data network.

[0114] - N9: Reference point between the two UPFs.

[0115] The reference points below illustrate the interactions that exist between NF services in NF.

[0116] - N5: Reference point between PCF and AF.

[0117] - N7: Reference point between SMF and PCF.

[0118] - N8: Reference point between UDM and AMF.

[0119] - N10: Reference point between UDM and SMF.

[0120] - N11: Reference point between AMF and SMF.

[0121] - N12: Reference point between AMF and AUSF.

[0122] - N13: Reference point between UDM and AUSF.

[0123] - N14: Reference point between the two AMFs.

[0124] - N15: Reference point between PCF and AMF in non-roaming scenarios, and reference point between PCF and AMF in the surveyed network in roaming scenarios.

[0125] - N16: A reference point between two SMFs (between an SMF in the visited network and an SMF in the home network in a roaming situation).

[0126] - N22: Reference point between AMF and NSSF.

[0127] In some cases, several NFs may need to be associated with each other to serve the UE.

[0128] An example of UE to network relay discovery is described.

[0129] UE-to-network relay discovery applies to both Layer 3 and Layer 2 UE-to-network relay discovery for public safety purposes and commercial services. To perform 5G ProSe UE-to-network relay discovery, remote UEs and UE-to-network relays can be pre-configured or configured using information as described in 3GPP TS 23.304 V18.4.0 S5.1.

[0130] In UE-to-network relay discovery, the UE can use pre-configured information or provisioned information for the relay discovery process.

[0131] Relay Service Codes (RSCs) are used in UE-to-network relay discovery to indicate the connectivity services offered by the UE-to-network relay to the remote UE. RSCs (including dedicated RSCs for emergency services) can be configured on both the UE-to-network relay and the remote UE as defined in 3GPP TS 23.304 V18.4.0S5.1.4. Based on the policies specified in 3GPP TS 23.304 V18.4.0S5.1.4, the UE-to-network relay and the remote UE can determine whether an RSC provides Layer 2 or Layer 3 UE-to-network relay services and whether the RSC is used for emergency services. UE-to-network relays supporting multiple RSCs can use multiple discovery messages to announce the RSCs, one RSC per discovery message.

[0132] Additional information not directly used for discovery can also be announced using the PC5-D protocol stack in a single or separate discovery message of type “Relay Discovery Additional Information” as defined in 3GPP TS 23.304V18.4.0 S5.8.3.1.

[0133] The following text will refer to Figure 5 and Figure 6 Examples describing the discovery process of Model A and Model B.

[0134] For example, Model A could be a one-way discovery process. Based on Model A, the "Notifying UE" can periodically broadcast discovery messages announcing the presence of the "Notifying UE" and the availability of services. The "Monitoring UE" that receives this message can use this information to configure direct communication with the "Notifying UE".

[0135] For example, Model B could be a two-way discovery process. Based on Model B, when a "discovering UE" broadcasts a query message requesting a specific service, the "discovering UE" receiving the query message can announce its presence and services through a response message. Through this interaction, the discovering UE can find the appropriate discovering UE and configure direct communication.

[0136] The following figures are provided to illustrate specific examples of this disclosure. Since the specific names of the devices or signals / messages / fields described in the figures are provided as examples, the technical features of this disclosure are not limited to the specific names used in the following figures.

[0137] Figure 5 An example of the UE-to-network relay discovery process based on Model A is shown.

[0138] An example will be provided to describe the UE-to-network relay discovery process based on Model A. Figure 5 This is an example of the UE-to-network relay discovery process based on Model A.

[0139] 1. A UE can send a UE-to-Network-Relay Discovery Announcement message to a network relay. This message may include the type of discovery message, the announcing party information, and the RSC. The UE-to-Network-Relay Discovery Announcement message can be sent based on the source Layer 2 ID and the destination Layer 2 ID.

[0140] For 5G ProSe-based Layer 3 UE-to-network relay, when the S-NSSAI associated with RSC is an allowed NSSAI for UE-to-network relay, Layer 3 UE-to-network relay may include RSC only in the UE-to-network relay discovery announcement message.

[0141] Remote UE1 through remote UE3 can determine the destination layer 2 ID used for signaling reception.

[0142] Remote UE1 to remote UE3 can monitor announcement messages based on the UE-to-network relay RSC corresponding to the desired service.

[0143] Optionally, the 5G ProSe UE can also send a relay discovery additional information message to the network relay as defined in 3GPP TS 23.304 V18.4.0 S6.5.1.3. The parameters included in this message, as well as the source layer 2 ID and destination layer 2 ID used to send and receive the message, are described in 3GPP TS 23.304 V18.4.0 S5.8.3.

[0144] The remote UE can select a network relay based on the information received in step 1.

[0145] The following figures are provided to illustrate specific examples of this disclosure. Since the specific names of the devices or signals / messages / fields described in the figures are provided as examples, the technical features of this disclosure are not limited to the specific names used in the following figures.

[0146] Figure 6 An example of the UE-to-network relay discovery process based on Model B is shown.

[0147] An example will be provided to describe the UE-to-network relay discovery process based on Model B. Figure 6 This is an example of the 5G ProSeUE to network relay discovery process based on Model B.

[0148] 1. A remote UE can send a UE-to-Network Relay Discovery Request message. The 5G ProSe UE-to-Network Relay Discovery Request message may include the type of discovery message, discoverer information, RSC, and optional destination information, and can be sent using the source Layer 2 ID and destination Layer 2 ID as described in 3GPP TS 23.304 V18.4.0 S5.8.3. A remote UE discovering a 5G ProSe UE-to-Network Relay can send a request message with an RSC associated with the desired connection service. This RSC is based on the policy / parameters specified in 3GPP TS 23.304 V18.4.0 S5.1.4.1.

[0149] 2. If the RSC included in the request message matches any (pre)configured RSC of the 5G ProSe UE to Network Relay, and the target information (if any) included in the request message matches the 5G ProSe UE to Network Relay, then the 5G ProSe UE to Network Relay (e.g., Relay 1 and Relay 2) can respond to the 5G ProSe remote UE with a UE to Network Relay discovery response message. The 5G ProSe UE to Network Relay discovery response message can include the type of discovery message, the discovered party information, and the RSC, and can be sent using the source stratum 2 ID and the destination stratum 2 ID.

[0150] For Layer 3 UE to Network Relay, when the S-NSSAI associated with the RSC belongs to the allowed NSSAI of 5G ProSe UE to Network Relay, 5G ProSe UE to Network Relay can respond only to the matching RSC in the UE to Network Relay discovery request message.

[0151] The 5G ProSe remote UE can select the 5G ProSe UE to the network relay based on the information received in step 2.

[0152] Additional methods to support Proximity Services (ProSe) are being discussed in 5GS. For example, there is a need to enhance ProSe to support multi-hops via NR PC5 reference points.

[0153] Traditional techniques do not effectively support multi-hop UE to network relay. Therefore, a method is needed to support multi-hop UE to network relay.

[0154] In this specification, UE (User Equipment) and terminal are used interchangeably. Furthermore, UE-to-network relay, ProSe UE-to-network relay, relay, relay UE, UE-NW relay, 5G ProSe UE-to-network relay, 5G ProSe UE-to-NW relay, and 5G ProSe UE-to-network relay UE are used interchangeably. Additionally, remote UE, 5G remote UE, and 5G ProSe remote UE are used interchangeably. Furthermore, a UE that is not a UE-to-network relay can be referred to as a remote UE or simply UE.

[0155] In this specification, UE to network relay can refer to all types of UE to network relay (e.g., Layer 2 UE to network relay, Layer 3 UE to network relay).

[0156] This manual focuses on the content presented. For ProSe-related operations and procedures, please refer to TS 23.304 V18.0.0, TS 24.554 V18.0.0, TS 33.536 V17.1.0, TS 33.503 V18.0.0, TS38.300 V17.4.0, TS 38.401 V17.5.0, TS 38.331 V17.5.0, etc.

[0157] In various examples in this specification, the methods proposed herein for supporting multi-hop UE to network relay can be configured by a combination of one or more of the following operations / configurations / steps.

[0158] For reference, the various examples in this specification may be applied only to Layer 3 UE to network relay, or may be applied to both Layer 3 UE to network relay and Layer 2 UE to network relay.

[0159] 1. A first example of the disclosure in this specification

[0160] The first example in this specification is an example of a method for providing additional parameters to a remote UE in the case of a multi-hop UE to network relay.

[0161] Here are examples of additional parameters used in the description announcement for multi-hop UE to network relay.

[0162] The additional parameter notification process can be related to a remote UE requesting the network relay to notify additional parameters for the following reasons.

[0163] Applications running on a 5G ProSe Layer 3 remote UE may require the NCGI (NR Cell Global ID) of the serving cell of the 5G ProSe Layer 3 UE to the network relay.

[0164] - 5G ProSe Layer 3 remote UEs may require a 5G ProSe Layer 3 UE with N3IWF support to select N3IWF in the serving cell's TAI of the network relay.

[0165] For multi-hop UE to network relay, additional parameter announcement procedures can also be supported. For multi-hop UE to network relay, such as... Figure 7 As illustrated in the example, there may be situations where other relays besides the one supporting network connectivity via a Uu reference point are also within network coverage. In this case, due to weaker signal strength or quality to the network, these other relays may have difficulty supporting network connectivity to the remote UE using a Uu reference point with network coverage. Furthermore, situations may exist such as... Figure 8As shown, the remote UE may be located at a distance that is either slightly far from or not close to the 5G ProSe UE-to-network relay, which supports the connection between the 5G ProSe remote UE and the network by using the Uu reference point.

[0166] Therefore, additional parameters from other 5G ProSe UE-to-network relays besides the 5G ProSe UE-to-network relay that supports the connection between the 5G ProSe remote UE and the network by using the Uu reference point (e.g., the NCGI of the serving cell or the NCGI of the nearest serving cell of another 5G ProSe UE (if available)) can also be used for 5G ProSe remote UEs.

[0167] In the following text, a 5G ProSe UE-to-network relay (or a 5G ProSe UE-to-network relay directly connected to the network) that supports the connection between the 5G ProSe remote UE and the network using the Uu reference point is referred to as a 1-hop 5G ProSe UE-to-network relay (or 1-hop relay or first 5G ProSe UE-to-network relay or hop #1 5G ProSe UE-to-network relay), while other 5G ProSe UE-to-network relays are referred to as n-hop 5G ProSe UE-to-network relays (or n-hop relay or nth 5G ProSe UE-to-network relay or #n 5G ProSe UE-to-network relay or hop #n 5G ProSe UE-to-network relay), considering the number of hops for each 5G ProSe UE-to-network relay from the network to the 5G ProSe remote UE. Here, n is a value greater than 1.

[0168] Additionally, a 5G ProSe UE-to-network relay directly connected to the network can be referred to as a direct-to-network 5G ProSe UE-to-network relay (or direct 5G ProSe UE-to-network relay or Uu 5G ProSe UE-to-network relay), and a 5G ProSe UE-to-network relay indirectly connected to the network can be referred to as an indirect-to-network 5G ProSe UE-to-network relay (or indirect 5G ProSe UE-to-network relay or PC5 5G ProSe UE-to-network relay or intermediate 5G ProSe UE-to-network relay). Therefore, in the following diagram, 5G ProSe UE-to-network relay #1 can be referred to as a direct-to-network 5G ProSe UE-to-network relay, and 5G ProSe UE-to-network relay #2 can be referred to as an indirect-to-network 5G ProSe UE-to-network relay. This applies throughout this specification.

[0169] For example, an n-hop 5G ProSe UE can be proposed to a network relay that can provide additional parameters to the 5G ProSe remote UE.

[0170] Figure 7 and Figure 8 The example shows a 2-hop UE to network relay, where 5G ProSe UE to network relay #1 is a 1-hop 5G ProSe UE to network relay, and 5G ProSe UE to network relay #2 is a 2-hop 5G ProSe UE to network relay, which can support the connection between the 5G ProSe remote UE and 5G ProSe UE to network relay #1.

[0171] The following figures are provided to illustrate specific examples of this disclosure. Since the specific names of the devices or signals / messages / fields described in the figures are provided as examples, the technical features of this disclosure are not limited to the specific names used in the following figures.

[0172] Figure 7 A first example scenario related to the announcement of additional parameters for multi-hop UE to network relay is illustrated.

[0173] Figure 7 This is example scenario #1 for additional parameter announcements from multi-hop UEs to network relays.

[0174] according to Figure 7 For example, a remote UE can connect to the network via trunk #2 and trunk #1.

[0175] Relay #1 can send relay discovery supplementary information to relay #2. The relay discovery supplementary information sent by relay #1 may include information related to cell-A.

[0176] according to Figure 7 For example, a 5G ProSe UE to Network Relay #2 can provide the NCGI of the serving cell of Relay #2 to a 5G ProSe Layer 3 remote UE. For instance, since the 5G ProSe UE to Network Relay #2 is in cell-B (at the edge of cell-B), the 5G ProSe UE to Network Relay #2 can provide cell-B-specific information to the 5G ProSe Layer 3 remote UE.

[0177] Relay #2 can send relay discovery supplementary information to remote UEs. Here, relay discovery supplementary information may include information about cell-A associated with relay #1 and information about cell-B associated with relay #2.

[0178] The following figures are provided to illustrate specific examples of this disclosure. Since the specific names of the devices or signals / messages / fields described in the figures are provided as examples, the technical features of this disclosure are not limited to the specific names used in the following figures.

[0179] Figure 8A second example scenario related to the notification of additional parameters for multi-hop UE to network relay is illustrated.

[0180] Figure 8 Example scenario #2 describes additional parameter announcements for multi-hop UE to network relay.

[0181] according to Figure 8 For example, relay #2 located in cell-B may be moved out of cell-B's coverage area.

[0182] Relay #1 can send relay discovery supplementary information to relay #2. The relay discovery supplementary information sent by relay #1 may include information related to cell-A.

[0183] according to Figure 8 For example, relay #2 provides the NCGI of the nearest serving cell of relay #2 to the 5G ProSe Layer 3 remote UE. For instance, as the 5G ProSe UE to network relay #2 moves out of network coverage (i.e., cell-B), the 5G ProSe UE to network relay #2 can provide the 5G ProSe Layer 3 remote UE with information for cell-B.

[0184] Relay #2 can send relay discovery supplementary information to remote UEs. Here, relay discovery supplementary information may include information about cell-A associated with relay #1 and information about cell-B associated with relay #2.

[0185] For example, 5G ProSe UE to network relay #2 can provide remote UEs with the last / most recently acquired cell information (information about the last cell it belonged to / connected to).

[0186] Reference Figure 9 An example describing the process of announcing additional parameters for multi-hop UE to network relay.

[0187] The following figures are provided to illustrate specific examples of this disclosure. Since the specific names of the devices or signals / messages / fields described in the figures are provided as examples, the technical features of this disclosure are not limited to the specific names used in the following figures.

[0188] Figure 9 An example of a process related to the notification of additional parameters in a multi-hop UE to a network relay is illustrated according to an embodiment of the present disclosure.

[0189] Figure 9 The procedure for announcing additional parameters for multi-hop UE to network relay is illustrated.

[0190] For simplicity, Figure 9The process illustrated in the example is a 2-hop UE to network relay. 5G ProSe UE to network relay #1 is a 1-hop 5G ProSe UE to network relay, and 5G ProSe UE to network relay #2 is a 2-hop 5G ProSe UE to network relay.

[0191] based on Figure 9 The procedure described in the example can also be applied to cases involving more than two hops of UE to network relay. Therefore, the description or operation for 5GProSe UE to network relay #2 (i.e., two-hop 5G ProSe UE to network relay) can also be applied to three or more hops of 5G ProSe UE to network relay (i.e., intermediate 5G ProSe UE to network relay).

[0192] 1. The 5G ProSe remote UE may have already detected the 5G ProSe UE to network relay used to connect to the network, and additional parameters may be required.

[0193] 2. The remote UE can send an additional parameter notification request to relay #2.

[0194] For example, a 5G ProSe remote UE can send an additional parameter announcement request to 5G ProSe UE to Network Relay #2 to obtain additional parameters from the 5G ProSe UE to Network Relay that provides the connection to the network.

[0195] 5G ProSe remote UE may include one or more of the following information: A) If an n-hop 5G ProSe UE to network relay exists / is available, request additional parameter information from the n-hop 5G ProSe UE to network relay (e.g., other 5G ProSe UE to network relays from the network besides the 1-hop 5G ProSe UE to network relay).

[0196] Ai) Optionally, it may include the maximum number of hops from the network (e.g., Nmax): If this information is included, the additional parameter notification request can be a request for additional parameters from a 2-hop 5G ProSe UE to a network relay to an Nmax-hop 5G ProSe UE to a network relay. Otherwise, the request can be a request for additional parameters from all n-hop 5G ProSe UEs to network relays (e.g., all other 5G ProSe UEs to network relays except for the 1-hop 5G ProSe UE to network relay).

[0197] The information in A) above may be excluded, and the information may include the value of Nmax or represent all values / information.

[0198] (A-ii) Optionally, it may include the maximum time elapsed since the n-hop 5G ProSe UE obtained additional parameters from the network relay: If this information is included, the additional parameter notification request can be a request for additional parameters obtained from the network relay from the n-hop 5G ProSe UE within the maximum time. For example, if the maximum time is 3 minutes, providing additional parameters to the 5G ProSe remote UE is only valid if less than 3 minutes have passed since the n-hop 5G ProSe UE obtained additional parameters from the network relay. Examples of times less than the maximum time have been described above, but both times equal to and less than the maximum time are also possible. If the maximum time information is not included, the additional parameter notification request can be a request for additional parameters most recently obtained from the network relay from the n-hop 5G ProSe UE.

[0199] Time information related to the maximum time can be expressed in various units (e.g., milliseconds, seconds, minutes, etc.). Alternatively, time information can be expressed as absolute time (e.g., requesting information after a specific year, month, day, hour, and minute). Alternatively, time information can be expressed in the form of a time window (e.g., requesting information within a specific period in the past relative to the current time).

[0200] The information in the request for additional parameters in A) above may be excluded, and may include a value / information containing the maximum elapsed time or representing infinite time.

[0201] When providing network connectivity services to a remote UE via N3IWF, one or more of the information in A), Ai), and A-ii) above may be excluded. Alternatively, one or more of the information in A), Ai), and A-ii) above may be included only when the remote UE is a Layer 3 remote UE that is not provided with network connectivity services via N3IWF. Alternatively, one or more of the information in A), Ai), and A-ii) above may be included only when the remote UE is a Layer 2 or Layer 3 remote UE that is not provided with network connectivity services via N3IWF.

[0202] Regardless of whether the above information is included in the request, additional parameters from the network to the network relay for a 1-hop 5G ProSe UE can be provided to the 5G ProSe remote UE.

[0203] 3. Relay #2 can send additional parameter notification response messages to remote UEs.

[0204] The 5G ProSe UE to network relay #2 can acknowledge receipt of the request in step 2 using an Additional Parameter(s)_Announcement_Request_Refresh timer. The Additional_Parameter(s)_Announcement_Request_Refresh timer (configurable in 5G ProSe UE to network relay #2) can be provided to the 5G ProSe remote UE. When this timer expires, the 5G ProSe remote UE can repeat the Additional Parameter(s)_Announcement_Request_Refresh request procedure if it needs additional parameters. If the 5G ProSe remote UE does not initiate a new Additional Parameter(s)_Announcement_Request_Refresh request procedure when the Additional_Parameter(s)_Announcement_Request_Refresh timer expires, and no other UE requests Additional Parameter(s)_Announcement_Request_Refresh in 5G ProSe UE to network relay #2 before the Additional_Parameter(s)_Announcement_Request_Refresh timer expires, then relay #2 can stop requesting Additional Parameter(s)_Announcement from 5G ProSe UE to network relay #1.

[0205] For reference, step 3 can be performed after receiving the message from step 5.

[0206] 4. Relay #2 can send an additional parameter notification request message to relay #1.

[0207] For example, based on the additional parameter notification request sent by the 5G ProSe remote UE in step 2, the 5G ProSe UE to Network Relay #2 can send an additional parameter notification request to the 5G ProSe UE to Network Relay #1 to obtain additional parameters from the 5G ProSe UE to Network Relay #1.

[0208] 5. Relay #1 can send an additional parameter notification response message to relay #2.

[0209] The 5G ProSe UE to Network Relay #1 can acknowledge receipt of the request in step 4 using an Additional Parameter(s)_Announcement_Request_Refresh timer. The Additional_Parameter(s)_Announcement_Request_Refresh timer, which can be configured in 5G ProSe UE to Network Relay #1, can be provided to 5G ProSe UE to Network Relay #2.

[0210] Note: It is assumed that the same Additional_Parameter(s)_Announcement_Request_Refresh timer is configured in all 5G ProSe UE-to-network relays. There may be cases where the timer values ​​configured between relays differ or different timer values ​​are received from the network. In this case, the timer value provided by 5G ProSe UE-to-network relay #1 (which can be provided in step 5) can be used by 5G ProSe UE-to-network relay #2 and the 5G ProSe remote UE. Therefore, 5G ProSe UE-to-network relay #2 can provide the timer value provided by 5G ProSe UE-to-network relay #1 to the 5G ProSe remote UE.

[0211] When the timer expires, if relay #2 needs to obtain additional parameters from the 5G ProSe UE to network relay #1 because the 5G ProSe remote UE still needs additional parameters, then 5G ProSe UE to network relay #2 can repeat the additional parameter announcement request process. If 5G ProSe UE to network relay #2 does not initiate a new additional parameter announcement request process when the Additional_Parameter(s)_Announcement_Request_Refresh timer in 5G ProSe UE to network relay #1 expires, and no other UE requests additional parameter announcement, then relay #1 can stop announcing additional parameters.

[0212] 6. Relay #1 can send relay discovery additional information to relay #2.

[0213] For example, a 5G ProSe UE to network relay #1 can announce additional parameters by sending a relay discovery additional information message. This operation can be repeated periodically at a configurable frequency (e.g., typically higher than the frequency associated with the Additional_Parameter(s)_Announcement_Request_Refresh timer) until no UE requests to announce additional parameters, as determined by the Additional_Parameter(s)_Announcement_Request_Refresh timer running in the 5G ProSe UE to network relay #1. For example, if the Additional_Parameter(s)_Announcement_Request_Refresh timer value is 5 minutes, the relay discovery additional information message can be repeated every 1 minute, which is a higher frequency than 5 minutes.

[0214] The relay discovery additional information message may include the relay service code, the notifying party information (e.g., the user information ID of the 5G ProSe UE to network relay #1), and one or more of the following additional parameters: - NCGI: Indicates the NCGI of the 5G ProSe UE to the serving cell of Network Relay #1. This parameter can be requested by an application running on a 5G ProSe Layer 3 remote UE.

[0215] - TAI: Indicates the Tracking Area (TA) ID of the serving cell of the 5G ProSe UE to Network Relay #1. This parameter can be used by 5G ProSe Layer 3 remote UEs to select N3IWF.

[0216] The relay discovery additional information message may include hop # (e.g., the number of hops), which can indicate how many hops the 5G ProSe UE is from the network relay #1 (e.g., in...). Figure 9 The hop count for relay #1 is 1.

[0217] Relay discovery additional information messages can be sent using one of the following destination layer 2 IDs: - Default destination Layer 2 ID configured / provided for sending and receiving relay discovery additional information messages: The default destination Layer 2 ID can be configured / provided to the 5G ProSe UE for sending to the network relay and to the 5G ProSe remote UE for receiving. Multiple default destination Layer 2 IDs can be configured / provided.

[0218] - Default destination Layer 2 ID configured / provided for sending and receiving relay discovery additional information messages from a 1-hop 5G ProSe UE to a network relay: The default destination Layer 2 ID can be configured / provided by a 1-hop 5G ProSe UE to a network relay (or the relay performing its operation) for sending, and by n-hop 5G ProSe UEs to a network relay (or the relay performing its operation) and 5G ProSe remote UEs for receiving. Multiple default destination Layer 2 IDs can be configured / provided.

[0219] - Destination Layer 2 ID assigned in response to a request from 5G ProSe UE to Network Relay #2 to send a relay discovery additional information message: The destination layer 2 ID can be assigned by 5G ProSe UE to Network Relay #1 when receiving the message in step 4, and can be notified to 5G ProSe UE to Network Relay #2 by being included in the message in step 5.

[0220] 7. Relay #2 can send relay discovery additional information to remote UEs.

[0221] For example, based on the relay discovery additional information message sent by the 5G ProSe UE to network relay #1 in step 6, the 5G ProSe UE to network relay #2 can send a relay discovery additional information message. The 5G ProSe UE to network relay #2 can provide its additional parameters in the relay discovery additional information message based on a request received from the 5G ProSe remote UE in step 2. If the additional parameters from the 5G ProSe UE to network relay #2 are available and need to be provided, the 5G ProSe UE to network relay #2 includes the relay service code, the notifying party information (e.g., the user information ID of the 5G ProSe UE to network relay #2), and the following additional parameters: - NCGI: Indicates the NCGI of the 5G ProSe UE to the serving cell or the nearest serving cell of network relay #2. This parameter can be requested by an application running on a 5G ProSe layer 3 remote UE.

[0222] The 5G ProSe UE to network relay #2 may provide its additional parameters only if the NCGI of the 5G ProSe UE to network relay #2 is different from the NCGI of the 5G ProSe UE to network relay #1. For example, an n-hop relay may provide its NCGI information only if the NCGI of the n-hop relay is different from the NCGI of the 1-hop relay. Alternatively, if there are other relays between the n-hop relay and the 1-hop relay, the n-hop relay may provide its NCGI information only if its NCGI is different from the NCGI of all other relays. Alternatively, only relays connected to the 5G ProSe remote UE may provide their own NCGI information. Alternatively, a relay may provide its own NCGI information only if the NCGI of the relay is determined based on the location (e.g., coordinate information) of the 5G ProSe remote UE (which may be included in step 2) and / or if its location (e.g., coordinate information) is close to the location of the 5G ProSe remote UE. Alternatively, NCGI information may be provided only when the 5G ProSe UE is within network coverage area of ​​network relay #2. In this case, timestamp information may be omitted. For example, in this disclosure, the statement that the UE is within network coverage area can be interpreted as follows: For example, the statement can be interpreted as the UE being directly connected to the network, the UE being able to directly connect to the network, the UE being served by a base station, the UE having a serving cell, the UE receiving / obtaining system information from a base station, the UE being registered in the network, or the UE being able to register in the network.

[0223] - Timestamp: Indicates the time when the 5G ProSe UE obtained the provided NCGI from network relay #2.

[0224] Timestamp information can be expressed as absolute time or UTC time (e.g., to indicate that NCGI information was acquired in a specific year, month, day, hour, and minute). Alternatively, timestamp information can be expressed in various units (e.g., milliseconds, seconds, minutes, etc.) to represent the time elapsed since the NCGI information was acquired.

[0225] - Information indicating whether the 5G ProSe UE is within network coverage area to network relay #2 (if the 5G ProSe UE is within network coverage area to network relay #2). This information can also be expressed using timestamp information.

[0226] If additional parameters from the 5G ProSe UE to network relay #2 are provided, the relay discovery additional information message may include hop # to indicate how many hops the 5G ProSe UE is from the network relay #2 (e.g., in...). Figure 9 The hop count for relay #2 is 2.

[0227] The 5G ProSe UE to Network Relay #2 can provide only its own additional parameters to the 5G ProSe remote UE. This can be performed only when the 5G ProSe UE to Network Relay #2 is within network coverage. When the 5G ProSe UE to Network Relay #2 provides only its own additional parameters to the 5G ProSe remote UE, the 5G ProSe UE to Network Relay #2 may not request additional parameters from the 5G ProSe UE to Network Relay #1. Alternatively, the 5G ProSe UE to Network Relay #2 may obtain additional parameters from the 5G ProSe UE to Network Relay #1 but not provide them to the 5G ProSe remote UE, or alternatively provide additional parameters for the 5G ProSe UE to Network Relay #2.

[0228] When 5G ProSe UE-to-Network Relay #2 is within network coverage, it can provide its own additional parameters to the 5G ProSe remote UE without requesting additional parameters from 5G ProSe UE-to-Network Relay #1. Then, when 5G ProSe UE-to-Network Relay #2 is outside network coverage or moves out of network coverage, it can request additional parameters from 5G ProSe UE-to-Network Relay #1.

[0229] The 5G ProSe UE to Network Relay #2 can determine to provide its own additional parameters in the following situations: For example, if the 5G ProSe UE to Network Relay #1 is connected to or was previously connected to a different PLMN than the 5G ProSe UE to Network Relay #2, or if the 5G ProSe UE to Network Relay #1 is connected to or was previously connected to the same PLMN as Relay #2, the 5G ProSe UE to Network Relay #2 can determine to provide its own additional parameters.

[0230] If the 5G ProSe UE is required to provide its own additional parameters to the 5G ProSe remote UE via network relay #2, relay #2 may provide the additional parameters after step 3. In this case, the message in step 7 can be understood as forwarding the message received from the 5G ProSe UE to network relay #1.

[0231] The relay discovery additional information message in step 7 can be sent using one of the following destination layer 2 IDs: - Default destination Layer 2 ID configured / provided for sending and receiving relay discovery additional information messages: The default destination Layer 2 ID can be configured / provided to the 5G ProSe UE for sending to the network relay and to the 5G ProSe remote UE for receiving. Multiple default destination Layer 2 IDs can be configured / provided.

[0232] - Default destination Layer 2 ID configured / provided for sending and receiving relay discovery additional information messages from 2-hop 5G ProSe UE to network relay: The default destination Layer 2 ID can be configured / provided by 2-hop 5G ProSe UE to network relay (or the relay performing its operation) for sending, and by 5G ProSe UE to network relay (or the relay performing its operation) with a hop count greater than 2 hops and by 5G ProSe remote UE for receiving. Multiple default destination Layer 2 IDs can be configured / provided.

[0233] - Default destination Layer 2 ID configured / provided for sending and receiving relay discovery additional information messages from n-hop 5G ProSe UEs to network relays: The default destination Layer 2 ID is configured / provided by n-hop 5G ProSe UEs to network relays (or the relays performing their operations) for sending, and by providing it to 5G ProSe remote UEs for receiving. Multiple default destination Layer 2 IDs can be configured / provided.

[0234] - Destination Layer 2 ID assigned in response to a request from the 5G ProSe UE to the network relay #2 to send a relay discovery additional information message: The destination layer 2 ID can be assigned by the 5G ProSe UE to the network relay #2 upon receiving the message from step 2, and can be notified to the 5G ProSe remote UE by being included in the message from step 3.

[0235] 8. The 5G ProSe UE to network relay #1 can detect new or updated additional parameters.

[0236] 9. Relay #1 can send relay discovery additional information to relay #2.

[0237] If a new or updated additional parameter is detected in step 8, the 5G ProSe UE to Network Relay #1 can announce the additional parameter by immediately sending a relay discovery additional information message. Relay #1 can repeat this operation periodically at a configurable frequency as in step 6 until no UE requests to announce the additional parameter, for example, until the Additional_Parameter(s)_Announcement_Request_Refresh timer in the 5G ProSe UE to Network Relay #1 expires.

[0238] 10. Relay #2 can send relay discovery additional information to remote UEs.

[0239] Based on the relay discovery additional information message sent by the 5G ProSe UE to network relay #1 in step 9, the 5G ProSe UE to network relay #2 can send a relay discovery additional information message. Based on the request received from the 5G ProSe remote UE in step 2 (refer to step 7 for the included information), the 5G ProSe UE to network relay #2 can provide its additional parameters in the relay discovery additional information message (if its additional parameters are available and still valid).

[0240] If the 5G ProSe UE to Network Relay #2 detects new or updated additional parameters, Relay #2 can immediately send a Relay Discovery Additional Information message including the new or updated additional parameters. This operation can be repeated periodically at a configurable frequency (typically higher than the frequency associated with the Additional_Parameter(s)_Announcement_Request_Refresh timer) until no UE requests to announce the additional parameters, as determined by the Additional_Parameter(s)_Announcement_Request_Refresh timer running in the 5G ProSe UE to Network Relay #2. If the 5G ProSe UE to Network Relay #2 provides additional parameters only when the 5G ProSe UE to Network Relay #2 is within network coverage, Relay #2 can send a message (e.g., a Relay Discovery Additional Information message) to notify the remote UE that Relay #2 has moved out of network coverage.

[0241] Applications running on a 5G ProSe remote UE can also use NCGI for 5G ProSe UE to network relay #2 (e.g., the application provides NCGI for 5G ProSe UE to network relay #2 in addition to providing NCGI for 5G ProSe UE to network relay #1 to the IMS network, or only provides NCGI for 5G ProSe UE to network relay #2 to the IMS network).

[0242] Applications running on a 5G ProSe remote UE can use the NCGI of the 5G ProSe remote UE's nearest serving cell (if that cell exists / is available) (for example, the application also provides the IMS network with the NCGI for the 5G ProSe remote UE).

[0243] The example above describes providing additional parameters for n-hop relay based on a request from a 5G ProSe remote UE, but this is only an example. For instance, additional parameters could also be provided based on local policies / configurations of the n-hop relay or policies / configurations received from the network.

[0244] For based on Figure 9 The example described can be used to extend existing additional parameters to notify request / response messages, or new PC5-S (PC5 signaling) messages can be defined and used.

[0245] For the described process, existing relay discovery additional information messages can be used in an extended manner, or new PC5-D (PC5 discovery) messages can be defined and used.

[0246] 2. A second example of the disclosure in this specification.

[0247] According to the second example in this specification, an example of a method for providing system information to a remote UE in the case of a multi-hop UE to network relay will be described.

[0248] In a two-hop UE-to-network relay scenario, a two-hop 5G ProSe UE-to-network relay (hereinafter also referred to as two-hop relay) can perform one or more of the following operations: 1) A 2-hop relay can provide the 5G ProSe remote UE with system information (i.e., CellAccessRelatedInfo and / or MIB and / or SIB) provided by the 1-hop 5G ProSe UE to the network relay. For example, a 2-hop relay can explicitly or implicitly express that the system information is provided by the 1-hop 5G ProSe UE to the network relay.

[0249] 2) A 2-hop relay can provide the 5G ProSe remote UE with system information about its own serving cell. For example, when the 2-hop 5G ProSe UE-to-network relay is within network coverage, the 2-hop relay can provide the 5G ProSe remote UE with system information about its own serving cell. For example, the 2-hop 5G ProSe UE-to-network relay can explicitly or implicitly notify the remote UE that the 2-hop relay is within network coverage. For example, the 2-hop 5G ProSe UE-to-network relay can explicitly or implicitly express that the system information was provided by the 2-hop 5G ProSe UE-to-network relay.

[0250] 3) A 2-hop relay can provide the 5G ProSe remote UE with system information about its nearest serving cell. For example, a 2-hop relay can provide the 5G ProSe remote UE with system information about its nearest serving cell only if the 2-hop 5G ProSe UE to the network relay is within network coverage for a specific time period recently.

[0251] For example, the system information may additionally include timestamp information indicating when the 2-hop 5G ProSe UE acquired the system information to the network relay. For example, the timestamp information may be expressed as absolute time or UTC time (e.g., to express that the system information was acquired in a specific year, month, day, hour, and minute). Alternatively, the timestamp information may express the elapsed time since the acquisition of the system information in various units (e.g., milliseconds, seconds, minutes, etc.).

[0252] For example, a 2-hop relay can explicitly or implicitly indicate that the system information is provided by a 2-hop 5G ProSe UE to network relay.

[0253] The operation described in the second example of this disclosure can be based on a request from a 5G ProSe remote UE (see the first example of this disclosure). Figure 9 Step 2 is executed by replacing system information with additional parameters, local policies / configurations for 2-hop relays, policies / configurations provided from the network, etc.

[0254] For example, when the 2-hop 5G ProSe UE to Network Relay is connected to or was previously connected to a different PLMN than the 1-hop 5G ProSe UE to Network Relay #1, or when the 2-hop 5G ProSe UE to Network Relay is connected to or was previously connected to the same PLMN as the 1-hop 5G ProSe UE to Network Relay #1, the above 2) to 3) can be performed.

[0255] The system information in 2) to 3) above may include location information (e.g., NCGI and / or TAI information), or the location information may be provided separately from the system information.

[0256] After performing 2) above, if the 2-hop 5G ProSe UE moves out of network coverage by the network relay, the 2-hop relay can notify the remote UE of this.

[0257] For the operation of the second example disclosed herein, existing PC5-RRC messages can be extended and used.

[0258] In the second example of this disclosure, the description focuses on two-hop UE-to-network relay and two-hop 5G ProSe UE-to-network relay, but this is only an example. The second example of this disclosure can also be applied to three or more hops of 5G ProSe UE-to-network relay in multi-hop UE-to-network relay.

[0259] 3. A third example of the disclosure in this specification

[0260] An example will be described of a method for providing UE-to-network relay location information to the AMF in the case of multi-hop UE-to-network relay.

[0261] Based on Figures 10a to 10c The example of the remote UE initial access procedure is described below. When based on... Figures 10a to 10c When the example diagram / procedure is extended to a two-hop UE to network relay scenario, the relay UE in the following diagram / procedure corresponds to a 1-hop 5G ProSe UE to network relay, and it can be understood that there are 2 hops 5G ProSe UE to network relay between the remote UE and the relay UE.

[0262] The following figures are provided to illustrate specific examples of this disclosure. Since the specific names of the devices or signals / messages / fields described in the figures are provided as examples, the technical features of this disclosure are not limited to the specific names used in the following figures.

[0263] Figures 10a to 10c An example of an initial access procedure for a remote UE according to an embodiment of the present disclosure is illustrated.

[0264] Figures 10a to 10c An example of the initial access procedure for a remote UE is shown.

[0265] For reference, for operations other than those described below, please refer to TS 38.401 V17.5.0. Figure 8 .19.1-1.

[0266] 1. Remote UEs and relay UEs can perform discovery procedures and establish PC5 connections.

[0267] 2. A remote UE can send an RRCSetupRequest to a relay UE.

[0268] 3. The relay UE can send SidelinkUEInformationNR to the gNB-DU.

[0269] 4. gNB-DU can send UL RRC messages to gNB-CU to transmit messages.

[0270] 5. gNB-CU can send a UE context modification request to gNB-DU.

[0271] 6. gNB-DU can send a UE context modification response to gNB-CU.

[0272] 7. gNB-CU can send DL RRC messages to gNB-DU to transmit messages.

[0273] 8. gNB-DU can send RRC reconfiguration messages to relay UEs.

[0274] 9. A relay UE can send an RRC reconfiguration complete message to the gNB-DU.

[0275] 10. gNB-DU can send UL RRC messages to gNB-CU to transmit messages.

[0276] 11. A relay UE can send an RRC establishment request message to the gNB-DU.

[0277] 12. gNB-DU can send an initial UL RRC message to gNB-CU.

[0278] 13. gNB-CU can send DL RRC messages to gNB-DU to transmit messages.

[0279] 14. gNB-DU can send RRC establishment messages to remote UEs via relay UEs.

[0280] 15. Relay UEs, gNB-DUs, and gNB-CUs can be prepared for PC5 and Uu RLC channels for SRB1.

[0281] 16. A remote UE can send an RRC establishment completion message to the gNB-DU via a relay UE.

[0282] 17. gNB-DU can send UL RRC messages to gNB-CU to transmit messages.

[0283] 18. gNB-CU can send initial messages to AMF.

[0284] 19. AMF can send an Initial Context Establishment Request message to gNB-CU.

[0285] 20. gNB-CU can send a UE context establishment request message to gNB-DU.

[0286] 21. gNB-DU can send security mode command messages to remote UEs via relay UEs.

[0287] 22. gNB-DU can send a UE context establishment response message to gNB-CU.

[0288] 23. A remote UE can send a safe mode completion message to the gNB-DU.

[0289] 24. gNB-DU can send UL RRC messages to gNB-CU to transmit messages.

[0290] 25. gNB-CU can send DL RRC messages to gNB-DU to transmit messages.

[0291] 26. gNB-DU can send RRC reconfiguration messages to remote UEs via relay UEs.

[0292] 27. A remote UE can send an RRC reconfiguration complete message to the gNB-DU.

[0293] 28. gNB-DU can send UL RRC messages to gNB-CU to transmit messages.

[0294] 29. gNB-CU can send an Initial Context Establishment Response message to AMF.

[0295] 30. Relay UEs, gNB-DUs, and gNB-CUs can prepare PC5 and Uu RLC channels for SRB / DRB.

[0296] The following operations may be performed before step 3 is executed, during step 15, or during step 16: For example, a 1-hop 5G ProSe UE to Network relay can obtain the location information (NCGI and / or TAI information) of a 2-hop 5G ProSe UE to Network relay. For example, if the 2-hop 5G ProSe UE to Network relay is within network coverage, this location information can be provided to the 1-hop 5G ProSe UE to Network relay.

[0297] For example, if a 1-hop 5G ProSe UE-to-Network relay obtains the location information of a 2-hop 5G ProSe UE-to-Network relay, the 1-hop 5G ProSe UE-to-Network relay can provide this location information to the base station. For example, when the 1-hop 5G ProSe UE-to-Network relay is connected to a different PLMN than the 2-hop 5G ProSe UE-to-Network relay, or when connected to the same PLMN, the 1-hop 5G ProSe UE-to-Network relay can provide the location information of the 2-hop 5G ProSe UE-to-Network relay to the base station. Alternatively, when the 1-hop 5G ProSe UE-to-Network relay is in a different cell than the 2-hop 5G ProSe UE-to-Network relay, or when in the same cell, the 1-hop 5G ProSe UE-to-Network relay can provide the location information of the 2-hop 5G ProSe UE-to-Network relay to the base station.

[0298] In step 18, if the 1-hop 5G ProSe UE to network relay provides the base station with the location information of the 2-hop 5G ProSe UE to network relay, the base station can provide the AMF with the location information of the 2-hop 5G ProSe UE to network relay.

[0299] Operations according to the third example of this disclosure can be performed based on local policies / configurations of 2-hop relays and / or 1-hop relays, policies / configurations / instructions provided from the network, etc.

[0300] In the event of a change in the location information of the 2-hop 5G ProSe UE to network relay (e.g., the relay moves out of network coverage, the serving cell changes, etc.), the 2-hop 5G ProSe UE to network relay can notify the 1-hop 5G ProSe UE to network relay of the change, and then the information can be provided to the network.

[0301] 4. Fourth example of the disclosure in this specification

[0302] An example of a method for providing UE-to-network relay location information to the SMF / PCF in the case of multi-hop UE-to-network relay will be described.

[0303] In the following text, based on Figure 11 The example will describe an instance of performing 5G ProSe communication via a 5G ProSe Layer 3 UE to a network relay without an N3IWF. If according to Figure 11 The attached diagram / process is extended to a two-hop UE to network relay scenario, then according to... Figure 11The attached diagram / process shows that the Layer 3 UE to NW relay corresponds to 1 hop 5G ProSe UE to network relay, and it can be understood that there are 2 hops 5G ProSe UE to network relay between the remote UE and the Layer 3 UE to NW relay.

[0304] The following figures are provided to illustrate specific examples of this disclosure. Since the specific names of the devices or signals / messages / fields described in the figures are provided as examples, the technical features of this disclosure are not limited to the specific names used in the following figures.

[0305] Figure 11 Examples of relay communication according to embodiments disclosed in this specification are illustrated.

[0306] For reference, for operations other than those described below, please refer to TS 23.304 V18.0.0. Figure 6 5.1.1-1.

[0307] 1a. Can perform authorization and configuration for Layer 3 UE to NW relay.

[0308] 1b. Can perform remote UE authorization and configuration.

[0309] 2. It can execute the PDU session establishment process.

[0310] 3. It can perform the discovery process.

[0311] 4. It can perform connection establishment for unicast mode communication. Optionally, the relay UE can establish a new PDU session.

[0312] 5. IP addresses / prefixes can be assigned.

[0313] 6. Layer 2 link modifications can be performed. Relay UEs can modify existing PDU sessions used for relaying.

[0314] 7. The relay can send remote UE report messages to the SMF. The remote UE report message may include the remote user ID and remote UE information.

[0315] It can send and receive relay services.

[0316] Before step 7 is executed, the following operations may be performed: For example, a 1-hop 5G ProSe UE to network relay can obtain the location information (NCGI and / or TAI information) of a 2-hop 5G ProSe UE to network relay. This location information can be provided to the 1-hop 5G ProSe UE to network relay when the 2-hop 5G ProSe UE to network relay is within network coverage.

[0317] For example, when a 1-hop 5G ProSe UE-to-Network relay obtains the location information of a 2-hop 5G ProSe UE-to-Network relay, the 1-hop 5G ProSe UE-to-Network relay can provide this information to the base station. This can be performed only if the 1-hop 5G ProSe UE-to-Network relay is connected to a different PLMN than the 2-hop 5G ProSe UE-to-Network relay. Alternatively, this can be performed only if both the 1-hop 5G ProSe UE-to-Network relay and the 2-hop 5G ProSe UE-to-Network relay are connected to the same PLMN. Alternatively, this can be performed only if the 1-hop 5G ProSe UE-to-Network relay is in a different cell than the 2-hop 5G ProSe UE-to-Network relay, or only if both the 1-hop 5G ProSe UE-to-Network relay and the 2-hop 5G ProSe UE-to-Network relay are in the same cell.

[0318] In step 7, if the 1-hop 5G ProSe UE-to-Network relay receives the location information of the 2-hop 5G ProSe UE-to-Network relay, the 1-hop 5G ProSe UE-to-Network relay can provide the SMF with the location information of the 2-hop 5G ProSe UE-to-Network relay for the remote UE. At this time, the user information and / or IP address and / or MAC address of the 2-hop 5G ProSe UE-to-Network relay can also be provided.

[0319] After that, although not in Figure 11 The example illustrates that the SMF can deliver remote UE reports from a 1-hop 5G ProSe UE to a network relay to the PCF. This can be used to provide the PCF with location information for a 2-hop 5G ProSe UE to a network relay for a remote UE.

[0320] The above operations can be performed based on local policies / configurations for 2-hop and / or 1-hop relays, or from policies / configurations / instructions provided by the network.

[0321] In the event of a change in the location information of the 2-hop 5G ProSe UE to network relay (e.g., the relay moves out of network coverage, the serving cell changes, etc.), the 2-hop 5G ProSe UE to network relay can notify the 1-hop 5G ProSe UE to network relay of the change, and then the information can be provided to the network.

[0322] 5. Fifth example of the disclosure in this specification

[0323] An example of a method for providing additional parameters to a remote UE in the case of a multi-hop UE to network relay will be described.

[0324] An example will be provided to describe the additional parameter announcement process via a multi-hop layer 3 U2N relay.

[0325] According to existing technology, the procedure for announcing additional parameters via multi-hop layer 3 U2N relays has not yet been defined.

[0326] To support multi-hop UE to network relay, additional parameter announcement procedures are required. For example, the additional parameter announcement procedure via multi-hop Layer 3 U2N relay can be described, including details regarding the processing of additional discovery messages.

[0327] Details regarding the handling of remote UE reports and additional discovery messages can be described.

[0328] An example of the "additional parameter announcement procedure" can be described. This procedure can be applied to multi-hop layer 3 U2N trunk scenarios.

[0329] The information required for the notification of additional parameters can be described based on TS 23.304 V18.4.0 S5.8.3.

[0330] Parameters can be added for the notification process of additional parameters via multi-hop layer 3 U2N relay.

[0331] Additional parameter announcement procedures can be defined via multi-hop layer 3 U2N relays.

[0332] An example of an identifier used for 5G ProSe UE to network relay will be described.

[0333] An example of a public identifier used for 5G ProSe UE-to-network relay will be described.

[0334] The following parameters can be used in the 5G ProSe UE to network relay discovery announcement message (Model A), where the source layer 2 ID and destination layer 2 ID can be used to send and receive the message, and the announcing party information and relay service code can be included in the message: - Source Layer 2 ID: 5G ProSe UE to Network Relay can select its own Source Layer 2 ID for 5G ProSe UE to Network Relay discovery.

[0335] - Destination Layer 2 ID: The destination layer 2 ID used for 5G ProSe UE to network relay discovery can be selected based on configuration.

[0336] - Notifying party information: Notifying party information can provide information about the notifying user (i.e., user information ID).

[0337] - Relay Service Code: This can be a parameter that identifies the connectivity services provided by the 5G ProSe UE-to-Network Relay to the 5G ProSe remote UE. The Relay Service Code can be configured in the 5G ProSe UE-to-Network Relay for announcement. Additionally, the Relay Service Code can also identify the authorized users to whom the 5G ProSe UE-to-Network Relay will provide services, and can be used to select relevant security policies or information (e.g., the Relay Service Code for a relay used only by police officers may differ from the Relay Service Code for a relay used only by firefighters, even if these relays provide connectivity to the same DN, such as supporting Internet access).

[0338] The following parameters can be used in the 5G ProSe UE to Network Relay Discovery Request message (Model B), where the source layer 2 ID and destination layer 2 ID can be used to send and receive the message, and the discoverer information and relay service code can be included in the message: - Source Layer 2 ID: 5G ProSe remote UEs can select their own Source Layer 2 ID for network relay discovery.

[0339] - Destination Layer 2 ID: The destination layer 2 ID used for 5G ProSe UE to network relay discovery can be selected based on configuration.

[0340] - Discoverer Information: Provides information about the discoverer user (e.g., user information ID).

[0341] - Target Information: Provides information about the user whose target was discovered (e.g., user ID).

[0342] - Relay Service Code: This can be connectivity information of interest to the discovering UE. The relay service code can be configured in 5G ProSe remote UEs interested in the relevant connectivity services.

[0343] The following parameters can be used in the 5G ProSe UE to network relay discovery response message (Model B), where the source layer 2 ID and destination layer 2 ID can be used to send and receive the message, and the discovery information and relay service code can be included in the message: - Source Layer 2 ID: 5G ProSe UE to Network Relay can select its own Source Layer 2 ID for 5G ProSe UE to Network Relay discovery.

[0344] - Destination Layer 2 ID: Can be set as the source Layer 2 ID of the received 5G ProSe UE to Network Relay Discovery Request message.

[0345] - Relay Service Code: The relay service code can identify the connection service provided by the 5G ProSe UE to the 5G ProSe remote UE by the network relay, which matches the relay service code from the corresponding discovery request message.

[0346] - Discovery information: Information about the discoverer can be provided (e.g., user information ID).

[0347] The following parameters can be based on the procedures used for 5G ProSe UE to network relay (e.g., based on...). Figure 12 The example procedure is used to relay discovery additional information messages (using model A), where the source layer 2 ID and destination layer 2 ID can be used to send and receive the message, and other parameters can be included in the message: - Source Layer 2 ID: 5G ProSe UE to network relay or 5G ProSe intermediate UE to network relay can choose the source layer 2 ID to send relay discovery additional information messages.

[0348] - Destination Layer 2 ID: The destination Layer 2 ID used to send the relay discovery additional information message can be selected based on configuration (e.g., the configuration described in Clause 5.1.4.1 of 3GPP TS 23.304 V18.4.0).

[0349] - Relay Service Code: A relay service code can be associated with this message. The relay service code can be used to identify the security parameters required for the receiving UE to process the discovery message.

[0350] - Notifying party information: Provides information about the notifying user (i.e., the user information ID of the 5G ProSe UE to network relay).

[0351] - 5G ProSe Intermediate UE to Network Relay Announcer Information: The 5G ProSe Intermediate UE to Network Relay announcer information identifies the 5G ProSe Intermediate UE to Network Relay with hop count = 2 (e.g., a 5G ProSe Intermediate UE to Network Relay located next to (positioned after) the 5G ProSe UE to Network Relay) with information (e.g., user information ID). This parameter may only apply to announcement procedures with specified additional parameters via multi-hop 5G ProSe Layer 3 UE to Network Relay (e.g., referencing based on...). Figure 12 (Example of the process).

[0352] - Additional parameters: Additional parameters for 5G ProSe Layer 3 UE to network relay (where applicable).

[0353] Note 1: The UE implementation can ensure that when the UE chooses its own source 2 ID, the self-selected source 2 ID is different between 5G ProSe direct discovery (including 5G ProSe UE to network relay discovery) in 3GPP TS 23.304 V18.4.0 S6.3.2 and 5G ProSe direct communication (including 5G ProSe UE to network relay communication) in 3GPP TS 23.304 V18.4.0 S6.4. Alternatively, the UE implementation can ensure that the self-selected source 2 ID is different from any other destination 2 ID configured as described in 3GPP TS 23.304 V18.4.0 S5.1 and any other self-selected source 2 ID used in 5G ProSe direct discovery (including 5G ProSe UE to network relay discovery) performed simultaneously with different discovery models.

[0354] Note 2: If 5G ProSe UEs from different PLMNs discover each other via network relays and 5G ProSe remote UEs, the relay service code can be associated with the same connectivity service, and the same relay service code can be configured based on the service level agreement between PLMNs.

[0355] This section will describe an example of an identifier used for 5G ProSe Layer 3 UE-to-network relay.

[0356] For 5G ProSe Layer 3 UE-to-network relay, the relay service code in the notification message is associated with a set of PDU session parameters (e.g., PDU session type, DNN, SSC mode, S-NSSAI, access type preference). The relay service code can also indicate whether the relay UE can provide secure N3IWF connectivity.

[0357] For 5G ProSe Layer 3 remote UEs that discover a 5G ProSe Layer 3 UE to a network relay, the relay service code in the request message indicates the PDU session parameters that the relay's PDU session should be able to support. The relay service code can also indicate whether the remote UE requires a secure N3IWF connection.

[0358] The following additional parameters can be used for relay discovery additional information messages from a 5G ProSe Layer 3 UE to a network relay (using Model A): - NCGI: Indicates the NCGI of the 5G ProSe Layer 3 UE to the serving cell of the network relay. This parameter can be requested by an application running on a 5G ProSe Layer 3 remote UE.

[0359] - TAI: Indicates the tracking area identifier of the serving cell from the network relay for a 5G ProSe Layer 3 UE. This parameter can be used by a 5G ProSe Layer 3 remote UE to select the N3IWF.

[0360] - NCGI of 5G ProSe Intermediate UE to Network Relay: Indicates the NCGI of the serving cell of a 5G ProSe intermediate UE to network relay with hop count = 2 (e.g., a 5G ProSe intermediate UE to network relay located next to (positioned after) a 5G ProSe intermediate UE to network relay). This parameter may only apply to additional parameter announcement procedures via multi-hop 5G ProSe Layer 3 UE to network relay.

[0361] An example will be provided to describe the additional parameter announcement process from a multi-hop 5G ProSe Layer 3 UE to the network relay.

[0362] refer to Figure 12 This section will describe the additional parameter announcement procedure. The additional parameter announcement procedure can be used by a 5G ProSe remote UE to request additional parameters from the network relay (using Model A). Based on the additional parameter announcement procedure specified in 3GPP TS 23.304 V18.4.0 S6.5.1.3, the differences will be focused on in the description. Figure 12 Examples.

[0363] The following figures are provided to illustrate specific examples of this disclosure. Since the specific names of the devices or signals / messages / fields described in the figures are provided as examples, the technical features of this disclosure are not limited to the specific names used in the following figures.

[0364] Figure 12 Examples of processes related to the notification of additional parameters according to the embodiments disclosed in this specification are illustrated.

[0365] Figure 12This is an example of the additional parameter announcement process via a multi-hop 5G ProSe Layer 3 UE to the network relay.

[0366] If the hop count between the 5G ProSe remote UE and the 5G ProSe UE and the network relay is 2, then Figure 12 The steps and message exchanges between the 5G ProSe intermediate UE and the network relay shown may not be performed.

[0367] 1. The 5G ProSe remote UE may have already detected the 5G ProSe UE to network relay used to connect to the network, and additional parameters may be required.

[0368] 2. Remote UEs can send additional parameter notification request messages to relays.

[0369] 5G ProSe remote UEs can send an additional parameter notification request, including the following additional information, to the 5G ProSe intermediate UE-to-network relay to obtain additional parameters: - Relay service code: Information about the connection service provided by the 5G ProSe UE to the network relay.

[0370] - Root relay information: Information that identifies the 5G ProSe UE to the network relay (i.e., user information ID).

[0371] In addition to the above-mentioned additional parameters, various parameters may be included to ensure that the additional parameter notification request message is delivered to the 5G ProSe UE-to-network relay providing network connectivity services to the 5G ProSe remote UE. For example, the following parameters may be included in the additional parameter notification request message: - Identification information of all relays located on (or forming paths / routes) used to connect 5G ProSe remote UEs to the network (e.g., user information IDs for each intermediate UE-to-network relay and UE-to-network relay).

[0372] Furthermore, the additional parameter notification request message may not include additional parameters, and a regular additional parameter notification request message can be sent. This corresponds to the situation where the 5G ProSe intermediate UE-to-network relay can forward the additional parameter notification request message to the 5G ProSe UE-to-network relay even without additional parameters.

[0373] 3-4. The 5G ProSe intermediate UE to network relay (hop count = n) can send an Additional Parameter Advertisement Request message to the next relay (e.g., intermediate UE to network relay (hop count = 2)). Ultimately, the Additional Parameter Advertisement Request message can be sent to the 5G ProSe UE to network relay.

[0374] 5. The 5G ProSe UE to network relay can send additional parameter announcement response messages to intermediate UE to network relays (hop count = 2).

[0375] For example, a 5G ProSe UE to network relay can acknowledge receipt of a request by sending an Additional Parameter(s) Announcement Request Refresh timer message.

[0376] 6-7. Additional parameter notification response messages can be sent to 5G ProSe remote UEs.

[0377] 8. 5G ProSe UE to network relay can announce additional parameters by sending a relay discovery additional information message. For more details, please refer to the description in Clause 5.8.3 of TS 23.304 V18.4.0 above.

[0378] 9. A 5G ProSe intermediate UE-to-network relay with hop count = 2 can forward relay discovery additional information messages sent by the 5G ProSe UE-to-network relay. When forwarding, if its (the 5G ProSe intermediate UE-to-network relay's) NCGI is available, the 5G ProSe intermediate UE-to-network relay with hop count = 2 can include the following additional information: - Announcer information for 5G ProSe intermediate UE to network relay: Information identifying the 5G ProSe intermediate UE to network relay based on hop count = 2 (or having hop count = 2) (e.g., user information ID).

[0379] - NCGI from 5G ProSe intermediate UE to network relay: Indicates the NCGI from a 5G ProSe intermediate UE to the serving cell of the network relay based on hop count = 2 (or with hop count = 2).

[0380] For example, a relay discovery additional information message can be forwarded from a 5G ProSe intermediate UE to a network relay if one or more of the following conditions are met. However, the following conditions are merely examples, and various other conditions can be applied to allow the relay discovery additional information message to be forwarded to a 5G ProSe remote UE: - In 5G ProSe, the intermediate UE to network relay supports the relay service code (RSC). This can be interpreted as supporting the connection service associated with the RSC.

[0381] - 5G ProSe intermediate UE to network relay is the case of intermediate UE to network relay for 5G ProSe remote UE.

[0382] - The case where the 5G ProSe intermediate UE to network relay is located at the next hop of the 5G ProSe UE to network relay (e.g., based on the number of hops from the network).

[0383] - 5G ProSe intermediate UE to network relay is the neighbor relay case of 5G ProSe UE to network relay.

[0384] - The case where a unicast link is formed between the 5G ProSe intermediate UE to network relay and the 5G ProSe UE to network relay.

[0385] - Cases where a 5G ProSe intermediate UE to network relay exists / is located on the path / route between a 5G ProSe remote UE and a 5G ProSe UE to network relay.

[0386] - The case where 5G ProSe intermediate UE to network relay has a configuration of destination layer 2 ID for the received relay discovery additional information message.

[0387] 10. For 5G ProSe intermediate UEs with hop count = n, relay discovery additional information messages can be forwarded to the network relay.

[0388] For example, a relay discovery additional information message can be forwarded from a 5G ProSe intermediate UE to a network relay if one or more of the following conditions are met. However, the following conditions are merely examples, and various other conditions can be applied to allow the relay discovery additional information message to be forwarded to a 5G ProSe remote UE: - In 5G ProSe, the intermediate UE to network relay supports the relay service code (RSC). This can be interpreted as supporting the connection service associated with the RSC.

[0389] - 5G ProSe intermediate UE to network relay is the case of intermediate UE to network relay for 5G ProSe remote UE.

[0390] - The case where the 5G ProSe intermediate UE to the network relay is located at the next hop of the 5G ProSe remote UE (e.g., based on the number of hops from the 5G ProSe remote UE).

[0391] - 5G ProSe intermediate UE to network relay is the neighbor relay case of 5G ProSe remote UE.

[0392] - The case where a unicast link is formed between the 5G ProSe intermediate UE and the network relay and the 5G ProSe remote UE.

[0393] - Cases where a 5G ProSe intermediate UE to network relay exists / is located on the path / route between a 5G ProSe remote UE and a 5G ProSe UE to network relay.

[0394] - The case where 5G ProSe intermediate UE to network relay has a configuration of destination layer 2 ID for the received relay discovery additional information message.

[0395] In the case of only one 5G ProSe intermediate UE to network relay, the forwarding conditions described in step 9 and the forwarding conditions described in step 10 can be interpreted in a combined / integrated form.

[0396] 11. 5G ProSe UE to Network Relay #1 can detect new or updated additional parameters. For example, 5G ProSe UE to Network Relay can detect new or updated additional parameters.

[0397] 12-14. Relays can send relay discovery additional information.

[0398] If a 5G ProSe intermediate UE-to-network relay with hop count = 2 detects new or updated additional parameters (e.g., a change in its serving cell, or removal from network coverage), the relay can send a relay discovery additional information message that includes the new or updated additional parameters. In this case, the 5G ProSe intermediate UE-to-network relay with hop count = 2 can include parameters related to the 5G ProSe UE-to-network relay in the relay discovery additional information message based on stored information. Therefore, the 5G ProSe intermediate UE-to-network relay with hop count = 2 can maintain a record of the additional parameters received from the 5G ProSe UE-to-network relay.

[0399] For example, steps 12 to 14 can be performed in the same manner as steps 8 to 10.

[0400] Note: NCGI from a 5G ProSe intermediate UE to a network relay with hop count = 2 can be used as a supplement by a 5G ProSe remote UE and may not be provided to the network side by the 5G ProSe remote UE.

[0401] The following figures are provided to illustrate specific examples of this disclosure. Since the specific names of the devices or signals / messages / fields described in the figures are provided as examples, the technical features of this disclosure are not limited to the specific names used in the following figures.

[0402] Figure 13 An example of a process performed according to an embodiment of the present disclosure is illustrated.

[0403] For reference only. Figure 13The procedures illustrated herein are merely examples, and the scope of disclosure herein is not limited to these examples. Figure 13 The limitations of the examples.

[0404] For example, for Figure 13 Example, Figures 1 to 12 The operations described in the examples can also be applied. For example, even Figure 13 While the examples do not directly describe the operations or content, the operations and content described in the various examples in this manual can also be applied.

[0405] For reference, Figure 13 In the example, the second relay can be a UE-to-network relay connected to the base station. The first relay can be an intermediate UE-to-network relay. Figure 13 The example illustrates direct communication between the first and second relays, but this is only an example. For instance, one or more intermediate UEs to network relays can exist between the first and second relays.

[0406] In step S1301, the remote UE may send an additional parameter notification request message to the first relay.

[0407] For example, the additional parameter notification request message may include the relay service code and root relay information.

[0408] For example, root relay information can identify information about the UE to a network relay (e.g., a second relay).

[0409] For example, a relay service code could be information related to the connection service provided by the UE to a network relay (e.g., a second relay).

[0410] In step S1302, the first relay may send an additional parameter notification request message to the second relay.

[0411] For example, based on the relay service code and root relay information, an additional parameter notification request message can be sent from the UE to the network relay (e.g., the second relay).

[0412] In step S1303, the second relay may send a first relay discovery additional information message to the first relay.

[0413] For example, based on the UE receiving an additional parameter notification request message to a network relay (e.g., a second relay), a first relay discovery additional information message can be received. As another example, based on the UE detecting new or updated additional parameters to a network relay (e.g., a second relay), a first relay discovery additional information message can be received.

[0414] For example, the first relay discovery additional information message may include additional parameters, new additional parameters, or updated parameters.

[0415] In step S1304, the first relay may send a second relay discovery additional information message to the remote UE.

[0416] For example, a first relay discovery additional information message may include a first hop count value. For example, a second relay discovery additional information message may include a second hop count value that is incremented by 1 from the first hop count value.

[0417] For example, the first relay discovery additional information message may include the UE's advertiser information to the network relay and the NR cell global ID (NCGI) of the UE to the network relay (e.g., the second relay).

[0418] For example, the second relay discovery additional information message may include the advertiser information from the intermediate UE to the network relay and the NR Cell Global ID (NCGI) from the intermediate UE to the network relay (e.g., the first relay).

[0419] For example, if the NCGI of the intermediate UE to the network relay (e.g., the first relay) is available, the second relay discovery additional information message may include the advertiser information of the intermediate UE to the network relay and the NR cell global ID (NCGI) of the intermediate UE to the network relay (e.g., the first relay).

[0420] For example, the notifying party information included in the first relay discovery additional information message may be information identifying the UE that sent the first relay discovery additional information message to the network relay (e.g., the second relay).

[0421] For example, the notifying party information included in the second relay discovery additional information message may be information identifying the intermediate UE that sent the second relay discovery additional information message to the network relay (e.g., the first relay).

[0422] For example, the NCGI included in the first relay discovery additional information message may be the NCGI of the UE to the serving cell of the network relay (e.g., the second relay).

[0423] For example, the NCGI included in the second relay discovery additional information message may be the NCGI of the intermediate UE to the serving cell of the network relay (e.g., the first relay).

[0424] For example, NCGI from a UE to a network relay can be requested by an application running on a remote UE.

[0425] For example, NCGI from an intermediate UE to a network relay can be requested by an application running on a remote UE.

[0426] For reference, the first relay can detect new or updated parameters. In this case, the first relay can send a third relay discovery additional information message to the remote UE, including the new or updated parameters. Contrary to the first example described in the disclosure of this specification, considering the number of hops from the remote UE, the 5G ProSe UE to network relay #2 can be referred to as a 1-hop 5G ProSe UE to network relay (or the first 5G ProSe UE to network relay or #1 5G ProSe UE to network relay or hop #1 5G ProSe UE to network relay). Additionally, the 5G ProSe UE to network relay #1 can be referred to as a 2-hop 5G ProSe UE to network relay (or the second 5G ProSe UE to network relay or #2 5G ProSe UE to network relay or hop #2 5G ProSe UE to network relay).

[0427] The following operations can be performed based on the implementation methods disclosed in this specification.

[0428] For example, 1) if a remote UE needs the location information of the UE to the network relay (e.g., NCGI and / or TAI information), the remote UE can request the UE to the network relay to provide additional parameters.

[0429] For example, 2) When an intermediate UE to network relay receives a request from a remote UE, the intermediate UE to network relay can request the 1-hop UE to network relay to provide additional parameters.

[0430] For example, 3) 1 hop UE to network relay can provide / announce its own location information.

[0431] For example, 4) an intermediate UE can send the location information of a 1-hop UE to the network relay.

[0432] For example, 5) while performing or instead of performing 4) above, the intermediate UE-to-network relay can provide / announce its own location information to the remote UE. If the intermediate UE-to-network relay is within network coverage, it can provide / announce its own location information to the remote UE. Alternatively, this can be performed only when the intermediate UE-to-network relay is in a different serving cell than the 1-hop UE-to-network relay.

[0433] For example, 6) if the location information of the intermediate UE to the network relay changes thereafter (e.g., moving out of network coverage, changing serving cell, etc.), the intermediate UE to the network relay can provide / announce the changed information to the remote UE.

[0434] This disclosure can have various effects.

[0435] For example, multi-hop UE to network relay can also effectively support the additional parameter announcement process. Additionally, in a multi-hop UE to network relay scenario, the location information (e.g., cell information) of the intermediate UE to the network relay can be provided to the remote UE or the network. Therefore, the location of the remote UE can be identified more accurately, or additional information can be provided to the network to identify the location of the remote UE.

[0436] The beneficial effects that can be obtained through specific embodiments of this disclosure are not limited to those listed above. For example, there may be various technical effects that can be understood and / or derived from this disclosure by those skilled in the art. Therefore, the specific effects of this disclosure are not limited to those explicitly described herein, but may include various effects that can be understood or derived from the technical features of this disclosure.

[0437] For reference, the operation of the terminal (e.g., UE, remote UE, relay UE, intermediate UE to network relay, UE to network relay) described in this disclosure can be performed as described above. Figures 1 to 3 This can be achieved through devices. For example, the terminal could be... Figure 2 The first device 100 or the second device 200. For example, the operation of the terminal described in this disclosure can be processed by one or more processors 102 or 202. The operation of the terminal described in this disclosure can be stored in one or more memories 104 or 204 in the form of instructions / programs (e.g., instructions, executable code) executable by one or more processors 102 or 202. One or more processors 102 or 202 can control one or more memories 104 or 204 and one or more transceivers 105 or 206, and execute the instructions / programs stored in one or more memories 104 or 204 to perform the operation of the terminal described in this disclosure.

[0438] Additionally, instructions for performing the operations of the terminal described in this disclosure may be stored in a non-volatile computer-readable storage medium on which they are recorded. This storage medium may be included in one or more memories 104 or 204. The instructions recorded in the storage medium may be executed by one or more processors 102 or 202 to perform the operations of the terminal described in this disclosure.

[0439] For reference, the operation of network nodes (e.g., AMF, SMF, UPF, PCF, V-UPF, UDM, 5GS, applications, etc.) or base stations (e.g., mobile base stations, NG-RAN, gNB, etc.) described in this disclosure can be described below. Figures 1 to 3 This is achieved through devices. For example, a network node or base station could be... Figure 2The first device 100 or the second device 200. For example, the operation of the network node or base station described in this disclosure can be processed by one or more processors 102 or 202. The operation of the terminal described in this disclosure can be stored in one or more memories 104 or 204 in the form of instructions / programs (e.g., instructions, executable code) executable by one or more processors 102 or 202. One or more processors 102 or 202 can control one or more memories 104 or 204 and one or more transceivers 106 or 206, and execute the instructions / programs stored in one or more memories 104 or 204 to perform the operation of the network node or base station described in this disclosure.

[0440] Additionally, instructions for performing the operations of the network nodes or base stations described in this disclosure may be stored in a non-volatile (or non-transitory) computer-readable storage medium in which they are recorded. This storage medium may be included in one or more memories 104 or 204. The instructions recorded in the storage medium may be executed by one or more processors 102 or 202 to perform the operations of the network nodes or base stations described in this disclosure.

[0441] Although preferred embodiments have been described above by way of example, this disclosure is not limited to these specific embodiments and may be modified, altered or improved in various forms within the spirit and scope of this disclosure and the claims.

[0442] In the exemplary system described above, the method is described based on a flowchart as a series of steps or blocks, but is not limited to the order in which the steps are described, and some steps may occur in a different order than described above or simultaneously with other steps. Additionally, those skilled in the art will understand that the steps shown in the flowchart are not exclusive, and other steps may be included or one or more steps of the flowchart may be deleted without affecting the scope of the claims.

[0443] The claims in this disclosure can be combined in various ways. For example, the technical features in the method claims of this disclosure can be combined to implement or perform in a device, and the technical features in the device claims can be combined to implement or perform in a method. Furthermore, the technical features in the method claims and device claims can be combined to implement or perform in a device. Other implementations are within the scope of the following claims.

Claims

1. A method, the method comprising: Receive additional parameter notification request message from remote user equipment (UE). The additional parameter notification request message includes a relay service code and root relay information, and The root relay information identifier refers to the information from the UE to the network relay; Send the additional parameter notification request message to the UE to the network relay; The UE receives a first relay discovery additional information message from the network relay; and Send a second relay discovery additional information message to the remote UE.

2. The method according to claim 1, in, Based on the relay service code and the root relay information, the additional parameter notification request message is sent to the UE to the network relay.

3. The method according to claim 1 or claim 2, in, The relay service code is information related to the connection service provided by the UE to the network relay.

4. The method according to any one of claims 1 to 3, in, The first relay discovery additional information message includes a first hop count value, and The second relay discovery additional information message includes a second hop count value that is incremented by 1 from the first hop count value.

5. The method according to any one of claims 1 to 4, in, Based on the additional parameter notification request message received by the UE to the network relay, or based on the new additional parameters or updated parameters detected by the UE to the network relay, the first relay discovers additional information message, and The first relay discovery additional information message includes additional parameters, the new additional parameters, or the updated parameters.

6. The method according to any one of claims 1 to 5, in, The NR Cell Global ID (NCGI) is available based on the intermediate UE to network relay, and the second relay discovery additional information message includes the advertiser information of the intermediate UE to network relay and the NCGI of the intermediate UE to network relay.

7. The method according to claim 6, in, The notifying party information is information identifying the intermediate UE to the network relay that sent the second relay discovery additional information message.

8. The method according to claim 6 or claim 7, in, The NCGI is the NCGI from the intermediate UE to the serving cell of the network relay.

9. The method according to any one of claims 6 to 8, in, The NCGI is requested by an application running on the remote UE.

10. The method according to any one of claims 1 to 9, wherein the method further comprises: Detect new or updated parameters; as well as Send a third relay discovery additional information message to the remote UE, including the new additional parameters or the updated parameters.

11. An apparatus comprising: At least one transceiver; At least one processor; as well as At least one memory, which stores instructions and is operatively connected to the at least one processor. The operation performed based on the instructions being executed by the at least one processor includes the method according to any one of claims 1 to 10.

12. A method, the method comprising: From the intermediate user equipment (UE) to the network relay, receiving additional parameter notification request messages sent by the remote UE. The additional parameter notification request message includes a relay service code and root relay information, and Wherein, the root relay information identifies the information from the UE to the network relay; and Send a first relay discovery additional information message to the intermediate UE to the network relay.

13. The method according to claim 12, in, The relay service code is information related to the connection service provided by the UE to the network relay.

14. The method according to claim 12 or claim 13, The method also includes detecting new additional parameters or updated parameters. in, The first relay discovery additional information message includes the new additional parameters or the updated parameters.

15. The method according to any one of claims 12 to 14, in, Based on the relay service code and the root relay information, the additional parameter notification request message is sent from the intermediate UE to the network relay to the UE to the network relay.

16. An apparatus comprising: At least one transceiver; At least one processor; as well as At least one memory, which stores instructions and is operatively connected to the at least one processor. The operation performed based on the instructions being executed by the at least one processor includes the method according to any one of claims 12 to 15.

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